A.High frequency heating:
High frequency power acts only on the moisture of the wood, it penetrate the wood and where there is water or moisture, there is high frequency power.So it dries fast and uniformly
B.Vacuum condition:
1) At vacuum condition, the water is vapored at very low temperature, so this eliminate the problem of sparking or spliting problem for hard wood, especially for the type of extremely hard wood that likely to spark if drying temperature is too high.
2) Further more, vacuum condition create a minus pressure in the tank, the movement of water through wood increases leading to shorter drying time than can be achieved at atmospheric pressure, this minus pressure suck the water or moisture out of the wood fast.
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